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# frozen_string_literal: true
module Gitlab
module Database
# Checks which `ignored_columns` definitions can be safely removed by
# scanning the current schema for all `ApplicationRecord` descendants.
class ObsoleteIgnoredColumns
def initialize(base = ApplicationRecord)
@base = base
end
def execute
@base.descendants.filter_map do |klass|
next if klass.abstract_class?
safe_to_remove = ignored_columns_safe_to_remove_for(klass)
next if safe_to_remove.empty?
[klass.name, safe_to_remove]
end.compact.sort_by(&:first)
end
private
def ignored_columns_safe_to_remove_for(klass)
ignores = ignored_and_not_present(klass).index_with do |col|
klass.ignored_columns_details[col.to_sym]
end
ignores.select { |_, i| i&.safe_to_remove? }
end
def ignored_and_not_present(klass)
ignored = klass.ignored_columns.map(&:to_s)
return [] if ignored.empty?
schema = klass.connection.schema_cache.columns_hash(klass.table_name)
existing = schema.values.map(&:name)
used = ignored & existing
ignored - used
end
end
end
end
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